﻿//-----------------------------------------------------------------------
// <copyright file="KeepActiveTenantAttribute.cs" company="OOHM PROCESSAMENTO DE DADOS LTDA.">
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//-----------------------------------------------------------------------
namespace AbstractSaaSTemplate.UI.Web.Filters.Globals{    using System;
    using System.Globalization;
    using System.Linq;
    using System.Web.Mvc;
    using AbstractSaaSTemplate.Domain.Repositories;

    /// <summary>
    /// Loads the ViewBag with the following information:
    /// (a) ActiveTenant
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
    public sealed class KeepActiveTenantAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// Initializes a new instance of the KeepActiveTenantAttribute class.
        /// </summary>
        public KeepActiveTenantAttribute()
        {
            this.RepositoryForTenancy = this.GetRepositoryFor<ITenancyRepository>();
            this.RepositoryForSystem = this.GetRepositoryFor<ISystemRepository>();
        }

        /// <summary>
        /// Gets the repository to operate 'Tenancy'.
        /// </summary>
        public ITenancyRepository RepositoryForTenancy { get; private set; }

        /// <summary>
        /// Gets the repository to operate 'System'.
        /// </summary>
        public ISystemRepository RepositoryForSystem { get; private set; }

        /// <summary>
        /// Called by the ASP.NET MVC framework before the action method executes.
        /// </summary>
        /// <param name="filterContext">The filter context.</param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (filterContext == null)
            {
                throw new ArgumentNullException("filterContext");
            }

            // retrieves the view bag
            var viewBag = filterContext.Controller.ViewBag;

            // var we get the tenant's key
            var appBaseDomain = this.RepositoryForSystem.GetConfigurationValueByKey(Application.Configuration.Keys.AppBaseDomain);

            const string TenantKeyPlaceHolder = "--key--";
            var placeHolderedDomain = string.Format(
                CultureInfo.InvariantCulture,
                appBaseDomain,
                TenantKeyPlaceHolder);

            var tenantKey = string.Empty;
            if (placeHolderedDomain.StartsWith(TenantKeyPlaceHolder, StringComparison.OrdinalIgnoreCase))
            {
                tenantKey = filterContext.HttpContext.Request.Url.Authority;
            }
            else
            {
                var frags = filterContext.HttpContext.Request.Url.PathAndQuery.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
                tenantKey = frags.FirstOrDefault();
            }

            // if no key was found, we do not try to load the tenant
            if (string.IsNullOrWhiteSpace(tenantKey))
            {
                return;
            }

            // loads all info for this filter
            viewBag.ActiveTenant = this.RepositoryForTenancy.GetTenantByKey(tenantKey);

            // invoke base's traditional event method
            base.OnActionExecuting(filterContext);
        }
    }
}


